Parametric Disc Golf Disc Generator

Design your own disc golf discs. This repo is a parametric OpenSCAD model of a disc golf disc, plus preset numbers for 28 famous PDGA-approved molds and a web-based designer. Punch in the four official PDGA measurements for any approved disc, tune a handful of shape sliders to match its silhouette, and print your own prototypes.

Files

File	What it is
disc.scad	The parametric model. Open in OpenSCAD, tweak via Window → Customizer, export STL.
disc.json	Customizer preset sets for all 28 famous molds — loads automatically next to disc.scad (pick a preset from the Customizer dropdown).
designer.html	Interactive designer: live cross-section preview, weight estimate, PDGA legality checks, shareable URLs. Use it online or just double-click the file (no server needed).

Quick start

OpenSCAD route: open disc.scad, open the Customizer (Window → Customizer), pick e.g. Innova Destroyer from the preset dropdown, press F6, export STL. The console echo prints the estimated solid volume/weight and PDGA legality notes.

Web route: open designer.html, pick a preset, drag sliders. The estimated weight and legality checks update live. When you like it:

• Copy shareable URL — the full design is encoded in the URL; bookmark it or send it to yourself to return to the exact design later.
• Copy OpenSCAD values — paste over the variables at the top of disc.scad.
• Download Customizer preset (.json) — import in OpenSCAD's Customizer ("+" button).

The web preview and the SCAD model share the identical Bezier profile and Pappus-theorem weight math, so the numbers match exactly.

Parameters

The four PDGA measurements come straight off any disc's certification page at pdga.com → Technical Standards → Approved Discs (PDGA lists them in cm; the model uses mm):

• diameter — outer diameter ("Diameter")
• height — resting plane to top center ("Height")
• rim_depth — rim bottom to flight-plate underside ("Rim Depth")
• rim_width — outer edge to inner rim wall ("Rim Thickness")

Shape character sliders control what PDGA numbers can't capture:

• flat_top — print-ready mode: the entire top becomes a perfect plane (dome and shoulder roll are ignored; the dome region is filled solid) and the model is exported top-down, so the STL drops into Bambu Studio / any slicer with no rotation and no supports. Discs print upside down, and a domed top only touches the build plate at a point — this mode trades the dome for a clean support-free print.
• dome (0–1) — flat top → very domey. Note: actual dome height is height − rim_depth − plate_thickness, which falls out of the PDGA numbers; this slider shapes the curve.
• shoulder_roll (0–1) — 0 keeps a flat band on top of the rim (visible crease where the dome meets it); higher values roll the dome continuously over the shoulder toward the nose, like most real molds. No effect on flat-top discs.
• nose_height (0.05–0.9) — the parting line: where the widest point sits, as a fraction of height. The dominant stability driver — Paradox ≈ 0.15 (super flippy), drivers ≈ 0.3, putters ≈ 0.5, Tilt ≈ 0.8 (parting line at the top plate, hyzer-only).
• nose_sharpness (0–1) — blunt putter nose → sharp driver nose. Roughly the inverse of PDGA's "Rim Configuration" rating (putters 55–70 → ~0.1; drivers 26–30 → ~0.75).
• wing_shape (−1 to +1) — concave driver undercut → straight → convex putter wing.
• bottom_land — width of the flat band the disc rests on.
• bead — bead size in mm (0 = beadless). A circular lobe at the rim's bottom-inside corner, always tangent to the resting plane (the bead ring is what the disc rests on; with a bead the land floats above it). Micro bead ≈ 0.4, classic (Wizard/Judge) ≈ 0.8–1, big bead ≈ 1.5.
• bead_angle (0–90°) — the direction the bead protrudes: 0° = straight down from the rim bottom at the wall line (how most beaded putters look — default), 45° ≈ the diagonal lobe in Innova's patent cross-section (US5531624 fig. 17), 90° = inward from the wall.
• plate_thickness, inner_wall_draft — flight plate and inner rim details.
• wall_fillet / wall_fillet_height — the blend where the inner rim wall meets the flight plate underside: wall_fillet is how far it spreads inward along the plate, wall_fillet_height how far it reaches down the wall. The fillet is tangent-matched to both surfaces (it follows the wall's draft angle and the underside's launch angle), so it flows instead of forcing a right angle.
• label_text — optional text engraved into the underside of the flight plate, centered (mirrored so it reads correctly when you flip the disc over; label_size/label_depth to taste).

Famous mold presets (PDGA-verified, July 2026)

Dimensions scraped from each mold's official PDGA certification page. Flight numbers are manufacturer-published. All lengths in mm, max weight in g.

Disc	Flight	Ø	Height	Rim depth	Rim width	Max wt
Putters & approach
Innova Aviar P&A	2/3/0/1	212	20	15	9	176.0
Dynamic Discs Judge	2/4/0/1	212	20	15	11	176.0
Discmania P2	2/3/0/1	212	21	15	10	176.0
Discraft Luna	3/3/0/2	211	20	14	11	175.1
Discraft Zone	4/3/0/3	211	20	13	12	175.1
Axiom Envy	3/3/−1/2	210	18	14	11	174.3
Gateway Wizard	2/3/0/2	210	21	18	10	174.3
Midranges
Discraft Buzzz	5/4/−1/1	217	19	13	12	180.1
Innova Roc3	5/4/0/3	218	20	13	14	180.9
Innova Mako3	5/5/0/0	217	19	14	14	180.1
Discmania MD3	5/5/0/2	218	19	13	14	180.9
Axiom Hex	5/5/−1/1	214	16	13	14	177.6
DD EMAC Truth	5/5/0/2	217	18	12	15	180.1
Axiom Paradox	5/4/−4/0	215	18	13	13	178.5
Fairway drivers
Innova Teebird	7/5/0/2	212	15	11	17	176.0
Innova Leopard	6/5/−2/1	212	16	11	16	176.0
Innova Eagle	7/4/−1/3	212	16	12	17	176.0
Latitude 64 River	7/7/−1/1	215	19	12	18	178.5
Discraft Undertaker	9/5/−1/2	211	18	11	19	175.1
Discmania FD	7/6/−1/1	212	18	11	18	176.0
Innova Roadrunner	9/5/−4/1	211	14	12	18	175.1
Discmania Tilt	9/1/1/6	211	16	12	20	175.1
Distance drivers
Innova Destroyer	12/5/−1/3	211	14	12	22	175.1
Innova Wraith	11/5/−1/3	211	14	12	21	175.1
Discraft Zeus	12/5/−1/3	211	16	12	23	175.1
Innova Shryke	13/6/−2/2	211	17	12	23	175.1
Discmania DD3	12/5/−1/3	210	18	12	24	174.3
Discraft Nuke	13/5/−1/3	212	16	12	25	176.0

Estimated flight numbers

The designer (and the echo in disc.scad) estimates speed / glide / turn / fade from the geometry as you design. The models are least-squares fits on this repo's 28 PDGA-verified presets, with extreme discs (Tilt +1/6, Paradox −4/0, Roadrunner −4) weighted more heavily so the stability scale spans the real range; cross-validated leave-one-out (typical error ±0.6–0.8 per number — comparable to published attempts on 900+ discs):

• Speed ← rim width. The dominant driver everywhere: r = 0.96 on a 112-disc Innova dataset (engenmt/Disc-Golf), whose fit (speed ≈ 7.11 × rim-width-cm − 4.77) matches ours. Roughly +1 speed per +1.4 mm of rim.
• Glide ← dome height (camber → lift), rim width, and (negatively) rim-depth-to-diameter ratio.
• Turn & fade ← nose height (plus dome, and wing shape for turn). Nose height is the parting-line height — the community's strongest stability predictor (higher PLH = more overstable): Flight Factory, Mint Discs. The Tilt (parting line at the top plate) and Paradox (parting line at the bottom) anchor the two ends of the scale. Flat tops add fade; domey tops add turn (DG Puttheads).

Caveats worth knowing: manufacturer flight numbers are marketing estimates, not measurements, and are inconsistent across brands; glide is the most inflated number (straslerj's analysis) and the model can't see outliers like the Tilt's glide-1 brick flight; the Roadrunner's −4 turn still reads as ≈ −2.5; and printed weight, plastic stiffness, and your arm speed all shift real flight. Physics background: Hummel's Frisbee flight simulation thesis and Potts & Crowther's wind-tunnel work.

PDGA legality (what the checks enforce)

From the current PDGA Technical Standards (May 2026 revision):

• Weight ≤ 8.3 g per cm of diameter (so a 21.1 cm disc caps at 175.1 g), absolute max 200 g
• Diameter 21.0–30.0 cm
• Rim depth 5–12 % of diameter
• Rim width ≤ 2.6 cm; inside rim diameter ≥ 15.8 cm
• Flight plate ≤ 0.5 cm thick; underside ≥ 0.3 cm above the rim-bottom plane
• Leading edge must pass a 1.6 mm radius gauge (no razor noses)
• Rim configuration rating ≥ 26; flexibility ≤ 12.25 kg; rim bottom must sit flush; no holes in the flight plate

Homemade discs aren't tournament-legal anyway (discs must be produced by a registered manufacturer), but staying inside these numbers keeps your prototypes flying like the real thing.

Printing tips

• Material: TPU (~95A) is the community favorite — durable and flexible like premium plastic. PETG works for stiff, overstable prototypes; PLA is easy but shatters on trees.
• Weight: the estimate is solid volume × density × print_factor. The 0.94 default is calibrated from a real 100 %-infill PLA print (167 g measured vs 178.4 g theoretical — even "solid" FDM prints run a few percent light from micro-voids and slight underextrusion). Re-calibrate for your printer by weighing one print and setting print_factor = measured ÷ theoretical. Tune slicer infill/walls down to hit lower targets.
• Orientation: discs print upside down (top on the plate). Turn on flat_top for a support-free print — it makes the top perfectly planar and exports the STL already flipped, ready to slice. A domed top printed upside down touches the plate at a single point and needs supports, which rarely come out well.
• First layer: the bottom land is the resting surface — a clean first layer matters. A slight negative wing_shape reduces elephant-foot impact on flight.
• Export at smoothness = 200+ and curve_steps = 48+ for production STLs.

Data sources

• PDGA approved-disc database: https://www.pdga.com/technical-standards/equipment-certification/discs (per-disc pages, e.g. Destroyer, Buzzz, Judge)
• PDGA Technical Standards: https://www.pdga.com/technical-standards ("Revised May 7, 2026" edition)
• Flight numbers: manufacturer catalogs (Innova, Discraft, Discmania, Dynamic Discs, Latitude 64, Axiom/MVP, Gateway)

License

MIT — see LICENSE. Disc mold names belong to their manufacturers; the measurements are public data from the PDGA certification database. This project is for personal prototyping and is not affiliated with the PDGA or any manufacturer.